[simplex]: run the testnet swaps through Hyperbridge's bundlers

[Wizdave97]

The "simplex testnet swaps" workflow now sends its UserOperations through Hyperbridge's own testnet bundlers instead of Pimlico:

• BSC Chapel: https://bundler.polytope.technology/bsc-chapel
• Polygon Amoy: https://bundler.polytope.technology/polygon-amoy

They need no API key, so the workflow names them directly in E2E_BSC_TESTNET_BUNDLER_URL and E2E_POLYGON_AMOY_BUNDLER_URL. The two repository secrets of the same names are no longer read and can be deleted. Alchemy stays as the RPC.

The e2e note's variable table and the EntryPoint v0.9 note are updated to match.

Validation

• Both endpoints answer for the right chain (0x61, 0x13882), list EntryPoint v0.9 and answer rundler_maxPriorityFeePerGas.
• Run locally against them with the SDK built from this branch, for the same-chain (97 to 97), cross-chain (97 to 80002) and partial (80002 to 97) routes: estimateFillOrder with requireBundlerEstimate succeeds, and so does estimateBidPreVerificationGas for a bid sponsored by the SimplexPaymaster.
• No fill has gone through them yet. The swaps run on this PR is that test.

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